.button {
  background-color: #39ace7;
  border: none;
  color: white;
  padding: 10px 40px;
  text-align: center;
  border-radius: 4px 4px 4px 4px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.groupChatInfoMask {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-color: #fff;
  opacity: 0;
  z-index: 98;
}